Official JVC RS20/HD750 Owners Thread! - Page 108  

Originally Posted by kutlow

I have the latest firmware the 1.25a. I just got home from Best Buy. Just as luck would have it they had a Dark Knight Blueray playing on the sammy A650 120 HTZ LCD. I tested the scene out and it is just like mine so this means it is in the source. The Blueray Player there was the Sammy one.

Originally Posted by rich wu

henrich3

Thanks for the setup information. The image is so much better after the adjustments. Looks like my unit has the original firmware so it needs some updating. The picture and sound via analog outputs is better than the Panasonic BD55.

Thanks again for your help.

Originally Posted by millerwill

For those of you who have been bothered by excessive grain on the RS20, what are some of the dvd or BR's that are the worst offenders? I would like to try the DNR feature on my BR player to see if it has a noticeable effect (as some have recommended).

Originally Posted by John Ballentine

Which BR player are you using that has DNR? (Panny?)

The best disc I have found that shows exacerbated noise/grain is Blu-ray version of 7th Voyage Of Sinbad (1958). You'll notice it right from the first frame. Sky blue scenes are filled w/ noise (and peoples faces have a "crawly" quality to them). If you turn down the brightness (via iris) it does help a lot.

This disc was grainy w/ the RS1 - but the grain looked like natural film grain (a good thing). At least the film was quite watchable. And you could always use (I rarely did) the RS1's NR feature if needed. Again - I do understand that the film grain was left in on purpose and that is a good thing (vs DNR usage), as long it is not exacerbated (which it is via the RS20).

However 95% of the movies I have watched (over 70 now) on the RS20 have not had noise or exacerbated grain issues. (there will always be certain problem titles w/ any machine)

Originally Posted by millerwill

I have a Sammy 1200; it has DNR though I've never used it. I don't have the Sinbad BR, but I suppose I could check out Casino Royale (opening fight scenes); though I think the grain there is intentional, it might nevertheless be a good test of the DNR on the BR player.

(BTW, I'm going to get the new Panny BDP-70V in a few months. It's the same BR player as the new 60 (which is essentially the same as the current 35), but it will be convenient to have a VHS player and see those old family tapes upconverted to 1080p!)

Originally Posted by Kevin McCarthy

Have any intrepid RS 20 / HD 750 owners peeked inside to see the make and model of the main fan? As an RS-1 owner who didn't make the leap to the RS20, but who would appreciate its much quieter cooling solution, I (and other RS-1 owners) would be very interested to know what fan JVC used. Granted, a fair portion of the improvement probably lies with lower internal resistance to airflow, as well as better fan isolation, but I'm pretty sure that the lamp power is the same, so the same amount of power needs to be removed. The Nidec fan used in the RS-1 is pretty cheap; I think that it was ~ $6. In addition to make and model, full knowledge of its replacement would also require that the fan voltage be measured, for at least low lamp / low altitude. Anyone know anything, or willing to look?

Kevin

Originally Posted by John Ballentine

I was thinking the same thing. I had thought about replacing my RS1 fan w/ a quieter fan way back when - but didn't want to chance overheating. Especially during the Summer months. I assumed the engineers made it as quiet as was possible anyway (for that design). The quieter fan in the RS20 is a nice feature (over RS1).

Originally Posted by Kevin McCarthy

I respectfully disagree. As my post points out, the internal air flow impedance was almost certainly reduced from the RS1 to the RS10/20, and the fan isolation may have been improved, but the net power removal (in watts) appears to be the same. In a number of products I design, air cooling is required. To simplify things (within 15%), a liter per second of airflow is required to keep the delta T at one degree C for a heat load of one watt. The fan in the RS1 is reasonably well isolated, but it is a cheap POS with readily discernible cogging and imbalance when hand held. JVC could have and almost certainly did spend more and got more when they selected the RS10/20 fan and determined its operating voltage, and this was after a fair degree of consumer complaints about the RS1. There is a very simple metric for fan model and voltage adequacy, and that is the air inlet to outlet delta T. If, as I expect, a fan with better aerodynamics, cogging, and balance was chosen for the RS-10/20, and an owner would identify the make/model and voltages, I could easily find the applied voltage on that fan (assuming that it has the same frame size and thickness) that would match the RS-1's inlet to outlet delta T, and hence provide equivalent lamp cooling.

I reiterate my request: if anyone, from Cine4home (who first identified the RS1 fan) to individual owners otherwise interested in the RS10/20's internals can determine the make, model, and ideally voltage(s) of the main fan, would you please post it? Thank you.

Oh, and as to the suggested "simple fix" (just turn the volume up), the films that we screen include (I know that this may be unbelievable) silent passages, in which the DP's work shines, and there aren't any car chases to mask projector noise.

Kevin

Originally Posted by Kevin McCarthy

I respectfully disagree. As my post points out, the internal air flow impedance was almost certainly reduced from the RS1 to the RS10/20, and the fan isolation may have been improved, but the net power removal (in watts) appears to be the same. In a number of products I design, air cooling is required. To simplify things (within 15%), a liter per second of airflow is required to keep the delta T at one degree C for a heat load of one watt. The fan in the RS1 is reasonably well isolated, but it is a cheap POS with readily discernible cogging and imbalance when hand held. JVC could have and almost certainly did spend more and got more when they selected the RS10/20 fan and determined its operating voltage, and this was after a fair degree of consumer complaints about the RS1. There is a very simple metric for fan model and voltage adequacy, and that is the air inlet to outlet delta T. If, as I expect, a fan with better aerodynamics, cogging, and balance was chosen for the RS-10/20, and an owner would identify the make/model and voltages, I could easily find the applied voltage on that fan (assuming that it has the same frame size and thickness) that would match the RS-1's inlet to outlet delta T, and hence provide equivalent lamp cooling.

I reiterate my request: if anyone, from Cine4home (who first identified the RS1 fan) to individual owners otherwise interested in the RS10/20's internals can determine the make, model, and ideally voltage(s) of the main fan, would you please post it? Thank you.

Oh, and as to the suggested "simple fix" (just turn the volume up), the films that we screen include (I know that this may be unbelievable) silent passages, in which the DP's work shines, and there aren't any car chases to mask projector noise.

Kevin

Originally Posted by Kevin McCarthy

I have no idea how to find the service/parts manual, but suppose that I could try and buy a replacement part through JVC.

Originally Posted by martinhome101

Hi, I was hoping to get some advise from RS20 owners on how the throw distance will effect the picture. Let me explain.

I will soon be upgrading my pj from a Sharp 720p to the RS20. My HT room is a bit odd because it is wide but the depth from pj to screen is only about 12.5', due to the way the ceiling is sloped in the back of the room (cant move pj back any more).

Using the throw distance calculator from the JVC web site, the optimal placement of the pj is about 16' but using the zoom-out it can be placed as close as 11.9'.

My question is - placing the pj at 12.5 ft with lens zoom at nearly the widest setting, will I be sacrificing much in terms of picture quality? I have read that in max telescope (opposite of what I am doing) the lumens are cut significantly, but I haven't seen any comment on the setup I plan on using. My room is light controlled, with 120" 1.3 gain firehawk screen.

I appreciate any feedback provided

Michael

Originally Posted by Tim Glover

Any RS20 owners here also have the new Pioneer Elite BD-09 player? or even the Pioner BDP-51 or 05? Have you tried the YCC 4:4:4 setting? For some reason, I can't seem to do that with the JVC. I just get a purple screen. With my former Sony VW-50, it was no problem. It's not a biggie by any means..just looking at different setting options.

Thanks.